Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$- { \left(2b-1 \right) }^{ 2 } -4 \times 1 \times ( { b }^{ 2 } -b-20)$$

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